use range instead of handcoded bounds

src/directory/footer.rs

@@ -102,10 +102,11 @@ impl Footer {
     /// Confirms that the index will be read correctly by this version of tantivy
     /// Has to be called after `extract_footer` to make sure it's not accessing uninitialised memory
     pub fn is_compatible(&self) -> Result<(), Incompatibility> {
+        const SUPPORTED_INDEX_FORMAT_VERSION_RANGE: std::ops::RangeInclusive<u32> =
+            INDEX_FORMAT_OLDEST_SUPPORTED_VERSION..=INDEX_FORMAT_VERSION;
+
         let library_version = crate::version();
-        if self.version.index_format_version < INDEX_FORMAT_OLDEST_SUPPORTED_VERSION
-            || self.version.index_format_version > INDEX_FORMAT_VERSION
-        {
+        if !SUPPORTED_INDEX_FORMAT_VERSION_RANGE.contains(&self.version.index_format_version) {
             return Err(Incompatibility::IndexMismatch {
                 library_version: library_version.clone(),
                 index_version: self.version.clone(),